Mon Aug 17, 2020

Nuclear Physics Seminar: Prof. Ani Aprahamian, University of Notre Dame

4:00 PM - 5:00 PM
zoom

COVID-19 and the NSL

 Prof. Ani Aprahamian
University of Notre Dame…

Posted In: Nuclear Seminar

Tue Aug 18, 2020

Particle Physics Seminar: Dr. Jack Setford, University of Toronto

4:00 PM - 5:00 PM
zoom

Title TBA

Dr. Jack Setford
University of Toronto

Hosted by Prof. Tsai

Posted In: Particle Physics Seminar

Wed Aug 19, 2020

Physics Colloquium: Prof. Stacy McGaugh, Case Western Reserve University

4:00 PM - 5:00 PM
Online streaming

The Acceleration Scale in Galaxy Dynamics

Prof. Stacy McGaugh
Department of Astronomy
Case Western Reserve University

The flat rotation curves of spiral galaxies played an essential role in establishing the dark matter paradigm. There is more to the story: the amplitude of the flat rotation speed correlates with the mass that is observed in stars and gas (the Baryonic Tully-Fisher Relation). The dynamical surface density (including all mass) correlates with that of the stars alone (the Central Density Relation). The total radial force correlates with that predicted by the observed distribution of baryons (the Radial Acceleration Relation). These empirical relations are all connected by a common acceleration scale that is of order 1 Angstrom/s/s. Understanding the origin of this scale is central to solving the missing mass problem. …

Posted In: Colloquia

Thu Aug 20, 2020

Condensed Matter Seminar: Dr. Manohar Kumar, Aalto University, Finland

4:00 PM - 5:00 PM
Online streaming

Dr. Manohar Kumar
Research Fellow
Department of Applied Physics
Aalto University, Finland

Particle collider in condensed matter physics for Anyons

Two-dimensional systems at low temperatures and at high magnetic field, can host exotic particles with elementary excitations carrying fractional charge e* = e/q such as in fractional quantum Hall effect 1 . These exotic particles are called anyons, whose quantum statistics are neither bosonic nor fermionic; instead they are predicted to obey fractional statistics 2 . The fractional charge of these anyons has been studied successfully using low frequency shot noise measurement 3,4 . However, no universal method for sensing them unambiguously exists 5 . Also, clear signature of the fractional statistics remains elusive. Here we exploited the Josephson relation of these anyonic states to determine the fractional charge of excited quasiparticles. The microwave photons emitted by voltage biased anyonic system obey the Josephson relation, like superconducting Josephson junction but with the charge q = e* rather than 2e. This provides    direct evidence of fractional charge in fractional quantum Hall effect 6 . Lastly, we also probed the fractional statistics in mesoscopic anyonic collider 7 . Our collision results explicitly extract the quantum phase of \phi = pi/3 for exchange of two anyonic quasiparticles with q = e/3. This is very first smoking gun result on fractional statistics of anyon. This collider geometry could be extended to perform ultimate braiding experiment to realized full potential of special kind of anyon called non-Abelian anyons in topological quantum computation.…

Posted In: Condensed Matter Seminar

Mon Aug 24, 2020

Nuclear Physics Seminar: August Gula & Shahina, University of Notre Dame

4:00 PM - 5:00 PM
zoom

Progress in low energy nuclear reaction measurements

August Gula & Shahina
Physics Graduate Students
University of Notre Dame

Hosted by Prof. Wiescher

 …

Posted In: Nuclear Seminar

Tue Aug 25, 2020

Particle Physics Seminar: Prof. James Wells, University of Michigan

4:00 PM - 5:00 PM
Online streaming

Unification and Precision Measurements

Prof. James Wells
University of Michigan

he Standard Model of particle physics may yet be unified into a deeper organizing principle. The gauge groups may unify into higher rank gauge group, and the Yukawa couplings might unify into a simplifying symmetry group. The key to assessing these unification prospects is precision measurements and related precision theory. The current status of unification, in its various guises, is discussed from the perspective of precision analysis. In addition, the prospects for further stress-testing the ideas at future experiment and through future theory work are also presented.…

Posted In: Particle Physics Seminar

Thu Aug 27, 2020

Condensed Matter Seminar: Jonathan White - Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, Switzerland

4:00 PM - 5:00 PM
virtual

Magnetic skyrmions at room temperature and far-from-equilibrium

Jonathan White
Laboratory for Neutron Scattering and Imaging
Paul Scherrer Institut, Switzerland

In condensed matter physics, the term magnetic skyrmion is applied to describe a novel twist in a smooth magnetization field characterized by a topological winding number. First discovered in 2009 as a lattice of whirlpool-like twists in a chiral cubic magnet, magnetic skyrmions have since been explored extensively both in other bulk crystals, and in synthetic systems such as magnetic multilayers. Regardless of the host system, the topological winding of skyrmions is the common ingredient that leads to unique physical properties that attract significant interest. For example, due to the topological winding it is not possible to smoothly deform a skyrmion into a topologically distinct state such as a ferromagnet; instead in a physical system the rupture of the topology requires overcoming an energy barrier. Thus, skyrmions when created display a robustness against perturbation and decay that is generally referred to as topological protection. This is a central concept underlying the long-term stability of skyrmions and their suitability for use in applications.

Posted In: Condensed Matter Seminar

Mon Aug 31, 2020

Nuclear Physics Seminar: Dr. James deBoer, University of Notre Dame

4:00 PM - 5:00 PM
zoom

AZURE for r-Matrix applications

Dr. James deBoer
University of Notre Dame

Hosted by Prof. Wiescher

Posted In: Nuclear Seminar

Tue Sep 1, 2020

Particle Physics Seminar: Prof. Tien-Tien Yu, University of Oregon

4:00 PM - 5:00 PM
zoom

Title TBA

Prof. Tien-Tien Yu
University of Oregon

Hosted by Prof. Tsai

Posted In: Particle Physics Seminar

Mon Sep 7, 2020

Nuclear Physics Seminar: Prof. Philippe Collon, University of Notre Dame

4:00 PM - 5:00 PM
zoom

AMS at Notre Dame, vision and future

Prof. Philippe Collon
Department of Physics
University of Notre Dame

Hosted by Prof. Wiescher

Posted In: Nuclear Seminar

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